OpenGL里画线

xShandow

<>在OpenGL里画线语句:
1 D& n* L+ t1 d! p0 C! L3 FglBegin(GL_LINES);
   glVertex2f(x,y);
   glVertex2f(a,b);
/ t& k$ U& O* J" FglEnd();</P>
<>注意:目前只讨论OpenGL 2D模式.

下面是一个画线实例和效果图
#define GL_PI 3.1415f</P>
# W$ H+ Y) P/ J<>void Draw()
{
GLfloat x,y,angle;</P>
<> glPushMatrix();</P>
<> glTranslatef(300,200,0);
, q$ ?- s% M9 T glColor3f(0.6f,0.6f,0.1f);
  @- {' H  J& b5 A. X3 \ glBegin(GL_LINES);
0 d8 U0 ^/ j& s! ~+ v  for(angle=0.0f;angle&lt;3*GL_PI;angle+=0.5f)
  {
   x=150.0f*sin(angle);
* v( W! g6 R8 X5 `0 }9 J   y=150.0f*cos(angle);</P>
5 i6 j' X, Q; ?/ y, s+ p<>   glVertex2f(x,y);</P>
<>   x=150.0f*sin(angle+3.1415f);
   y=150.0f*cos(angle+3.1415f);
   glVertex2f(x,y);
  }
  
% r+ D+ O+ S) G: w3 w glEnd();</P>
<> glPopMatrix();
- u6 Q" ?# ]8 G+ t! F. z}
</P>